Often change is not the result of one specific thing rather it is the convergence of numerous factors coming together to create collective change. One would have to be living in a cave not to recognize that changes in markets, economics, politics, power and communications are all being fueled by digital technology.
The forces driving much of the need to change are new market models being discovered by those creating innovative products and this entirely new markets. The forces pushing against these new models are the old mental models of organizations and markets being threatened by the new market models. However even those living in the old mental models are being forced to adopt to new measures of success for fear of loosing what they got.